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To allow the ability to have guaranteed-unique cursors, we make two important updates: * Add new updated_at_ms and created_at_ms columns that are in millisecond precision * Guarantee uniqueness -- if multiple items are inserted at the same millisecond, bump the new one by one millisecond until it becomes unique This lets us use single-number cursors for forwards and backwards paging through resultsets and guarantee that the cursor is a fixed point to do (timestamp > cursor) and get new items only. This updated implementation is backwards-compatible since multiple appservers can be running and won't handle the previous method well.